Chapter ANNEX II TABLE: CATEGORIZATION OF NUCLEAR MATERIAL
| Category | ||||
|---|---|---|---|---|
| Material | Form | I | II | III(c) |
(a) All plutonium except that with isotopic concentration exceeding 80% in plutonium–238. | ||||
(b) Material not irradiated in a reactor or material irradiated in a reactor but with a radiation level equal to or less than 100 rads/hour at one metre unshielded. | ||||
(c) Quantities not falling in Category III and natural uranium should be protected in accordance with prudent management practice. | ||||
(d) Although this level of protection is recommended, it would be open to States, upon evaluation of the specific circumstances, to assign a different category of physical protection. | ||||
(e) Other fuel which by virtue of its original fissile material content is classified as Category I and II before irradiation may be reduced one category level while the radiation level from the fuel exceeds 100 rads/hour at one metre unshielded. | ||||
1 Plutonium f1 | Unirradiated f2 | 2 kg or more | Less than 2 kg but more than 500 g | 500 g or less but more than 15 g |
2 Uranium–235 | Unirradiated – uranium enriched to 20% 235U or more | 5 kg or more | Less than 5 kg but more than 1 kg | 1 kg or less but more than 15 g |
| – uranium enriched to 10% 235U but less than 20% | 10 kg or more | Less than 10 kg but more than 1 kg | ||
| – uranium enriched above natural, but less than 10% 235 | 10 kg or more | |||
3 Uranium–233 | Unirradiated | 2 kg or more | Less than 2 kg but more than 500 g | 500 g or less but more than 15 g |
4 Irradiated fuel | Depleted or natural uranium, thorium or lowenriched fuel (less than 10% fissile content) f3 f4 | |||
Annotations
Footnotes
- f1
(a)
All plutonium except that with isotopic concentration exceeding 80% in plutonium–238.
- f2
(b)
Material not irradiated in a reactor or material irradiated in a reactor but with a radiation level equal to or less than 100 rads/hour at one metre unshielded.
- f3
(d)
Although this level of protection is recommended, it would be open to States, upon evaluation of the specific circumstances, to assign a different category of physical protection.
- f4
(e)
Other fuel which by virtue of its original fissile material content is classified as Category I and II before irradiation may be reduced one category level while the radiation level from the fuel exceeds 100 rads/hour at one metre unshielded.